"Theroux grew up in New York, most of his family are on the East Coast, so rumour is that after Aniston's wedding in California, there will be something in New York. There's certainly going to be a wedding party on the East Coast.
"It might not even be until the summer, but Theroux has taken charge of his side of the organisation and is really getting into it. He's arranging live music and the theme is going to be very rock 'n' roll" contactmusic.com quoted a source as saying.
While Theroux, 41, is organising a party, Aniston's ceremony is likely to be more romantic and chilled out. "Aniston wants it to be really relaxed and quite classic. it will be traditional," the source added.
The couple is also thought to have agreed to divide their time between the East and the West coast once they are married.